Snabb googling sade att du kan hålla ner PS knappen - Adjust Sound and Devices - Volume Control, det ska funka på headset/förstärkare etc.,
Citat:
To turn down the game volume on a PS4, hold down the PS button on the controller and select “Settings.” From there, go to “Sound and Screen” and then “Audio Output Settings.” You can then adjust the game volume slider to your desired level.
To turn the game volume down on a PS4, hold down the “L1” and “R1” buttons on the controller until the volume slider appears on the screen.
Then use the left analog stick to move the slider to the left to lower the volume.
